Joseph koetschet and maurice betjdet



- JOSEPH KOETSCHET AN'D MAURICE BEUDET, 0F LYON, i i":

non, assrenons 'rosocrn'rn CHIMIQUE DES USINES DU ONE, ANCIENNEMENT GILLIARD, P. MONNET ET No Drawing.

pared by causing acetylene to react with glacial acetic acid in presence of sulfate or phosphate of mercury.

It has been found that this reaction takes place in a very eflicient manner with sulfate of mercury; in order to accelerate the fixation of the acetylene however, working at about 90 C. is necessary. At this high temperature there is a pretty intense formation of tar, and moreover the ethylidene diacetate undergoes appreciable splitting up owing to the sulfuric acid liberated bydecomposition of the catalyzer.

. All the other mineral acid salts of mercury act incomparably less well than the sulfate. In particular the phosphate (the has absolutely no action. It is the same with the chlorids of mercury.

The specification of the patent states further that the reaction can be facilitated by adding mineral acids or acid salts to the catalyzer. Experiments made in this sense,

however, have shown that only sufuric acid produced an appreciable effect on lowering the temperature of reaction, but that this addition had the serious disadvantage of considerably reducing the yield.

All this shows that the reaction is far from having the general character attrib-.

catalyze the reaction perfectly. The use of a the aliphatic sulfonic acids (sulfacetic acid, methionic acid, etc.,) may however, be especially insisted upon.

manura c'ru' or nrmnnnn :nmcn'ra'rn Specification of Letters Patent. Patented J mm 11'? 1am, Application filed December 7, 1911.7. Serial No. 206,124

Example 1: 40 parts of oxid of mercury are dissolved in 800 parts of acetic acid, raised to about 70 0., and then while stirring, there is added in a slender stream a hot solution of Beta-naphthenesulfonic a-ciduw 50 parts. in acetic acid 200' parts.

A. white precipitate of naphthenesulfonate of mercury is formed.

In the mixture thus obtained 200 parts of acetylene are absorbed during a period of 2 hours at 70 C.

The excess of acetic acid is then separated by the known processes from the diacetate formed.

Example 40 parts of oxid of mercury are dissolved in 1000 parts of glacial acetic acid raised to 70 Q. llnto this solution is run the following mixture 230 parts of acetylene are fixed on the acetic acid in a period of 5 hours at 65 C.

At the end of the operation the mixture of diacetate and acetic acid obtained is very little colored and perfectly limpid. only salt besides sulfate cited in the patent) What we claim and desire to secure )llaetters Patent is: i l. A. process of producing ethylidene diacetate by the action of acetylene on acetic acid, characterized in that the treatment; takes place in presence of a sulfonic acid and acetate of mercury.

2. A process of producing ethylidene diacetate by the action of acetylene on acetic acid, characterized in that the treatment takes place in presence of an aromatic sulfonic acid and acetate of mercury.

an process of producing ethylidene diacetate bythe action of acetylene on acetic acid, characterized in that the treatment takes place in presence of benzenesulfonlc acid and acetate of mercury.

lln testimony whereof we have signed our names to this specification.

aosnrn Konrscnnr. MAURICE BEUDET.

Witnesses:

E. Esonnn, MARIN KACHON. 

